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You can probably send it back, open a dispute on ebay for item not as described and once the seller gets the razor you'll get your money incl. the shipping to you. But you'll probably have to pay for...

For shipping within US with first class they can buy insurance and delivery confirmation and still be at around the $5 mark.

In any case the seller has to figure out this part at the time they...

They don't need any proof, they have the invoice the seller generated, so they know the seller put on shipping charges that were not in the listing. You should call ebay though - they often have long...

Your option is to wait until they fix the shipping back to zero, if they don't, report them to ebay, because increasing the shipping after the end of the auction is against their terms.
And don't...